城市河道边界条件对水力特性和溶解氧的影响  

Effect of Urban River Boundary Conditions on the Hydraulic Characteristics and Dissolved Oxygen

作　　者：杨纪伟[1] 贺贝贝[1] 王志国[1] 朱海岩[1] 

机构地区：[1]河北工程大学水电学院,河北邯郸056021

出　　处：《人民黄河》2013年第5期56-57,65,共3页Yellow River

基　　金：水利部公益性行业科研专项(201001092);河北省教育厅科学研究计划项目(ZD2010125);水资源与水电工程科学国家重点实验室开放研究基金资助项目(2012B099);邯郸市科学技术研究与发展计划项目(1122101039-4)

摘　　要：通过室内水槽模型试验,对修建挡水建筑物后城市河道在不同坡度、不同流量下的水力特性和溶解氧变化进行了研究。结果表明:①受橡胶坝壅水作用影响,各工况下坝前水深均达到最大值,在选取的流量、坡度条件下,流量变化对水深比沿程变化的影响要大于坡度的;②在选取的流量、坡度条件下,流量的变化对流速比沿程变化的影响要大于坡度的;③在相同坡度下,流量越大,溶解氧含量比越大,但在坡度为0.5%时此现象不明显,相同流量下,坡度越缓,溶解氧含量比越小,在选取的坡度、流量条件下,流量变化对溶解氧含量比沿程分布的影响要大于坡度的。Through the indoor flume model experiment, after constructing water retaining structure , hydraulic characteristics and dissolved oxygen changes of urban fiver were studied under different slopes and flows. The results show that ： 1 ） The role of rubber dam backwater effects of various operating conditions of the dam reached the maximum water depth, in the selected flow and slope conditions, the effect of flow changes on the water depth ratio along the distribution is greater than the slope ; 2） In the selected flow and slope conditions, the effect of flow changes on the flow veloc- ity ratio along the distribution is greater than the slope ; 3 ） In the same slope and different flow conditions, the greater the flow, the greater the dis- solved oxygen ratio is, but at a gradient of O. 5 % , this phenomenon is not obvious ; in the same flow rate the more gentle the slope, the smaller dissolved oxygen ratio is. In the selected slope and flow conditions, the effect of flow changes on the dissolved oxygen ratio along the distribution is t^aeater than that of the slooe.

关 键 词：溶解氧 水力特性 边界条件 流量 坡度 城市河流 

分 类 号：TV133[水利工程—水力学及河流动力学] X522[环境科学与工程—环境工程]